首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   41607篇
  免费   1633篇
  2020年   528篇
  2019年   824篇
  2018年   933篇
  2017年   1138篇
  2016年   1219篇
  2015年   931篇
  2014年   908篇
  2013年   14071篇
  2012年   1046篇
  2011年   1075篇
  2010年   1078篇
  2009年   1068篇
  2008年   1011篇
  2007年   928篇
  2006年   835篇
  2005年   578篇
  2004年   574篇
  2003年   529篇
  2002年   509篇
  2001年   510篇
  2000年   449篇
  1999年   508篇
  1998年   455篇
  1997年   418篇
  1996年   404篇
  1995年   414篇
  1994年   359篇
  1993年   403篇
  1992年   387篇
  1991年   296篇
  1990年   287篇
  1989年   307篇
  1988年   307篇
  1987年   329篇
  1986年   305篇
  1985年   415篇
  1984年   451篇
  1983年   451篇
  1982年   394篇
  1981年   381篇
  1980年   418篇
  1979年   412篇
  1978年   406篇
  1977年   426篇
  1976年   377篇
  1975年   381篇
  1974年   284篇
  1973年   263篇
  1972年   244篇
  1970年   221篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
891.
892.
893.
894.
Current theoretical understanding of compliance with international law is based on an assumption that international law consists of a finite set of objective, compulsory rules. This image does not match reality but the two can be reconciled through theorising international law as ideology. Such an approach subsumes questions as to why states do or do not obey law and what influence international law has on foreign policy decision making. By placing the relationship of state behaviour to international law in a broader perspective it can account for previously identified determinants of compliance and provide a basis on which to assess their relative significance. At the same time, the research agenda regarding compliance is broadened by the introduction of fresh questions.  相似文献   
895.
896.
897.
In recent years, cultural anthropologists have made notable progress in understanding the bewildering variety of material exchange transactions found among the aboriginal populations of highland New Guinea. One of the major findings of this work is that competitive exchange behavior may bring in its wake alterations in agronomic practices involving an intensification of production. That intensification is primarily a product of social behavior, rather than an adaptation to climate change or population pressure, is a significant conclusion that should influence the thinking of archaeologists as they investigate past episodes of agronomic change, including the origins of agriculture.  相似文献   
898.
Significant advances in our understanding of ancient agricultural practices in the Americas have been made in recent years. This review of the literature focuses on studies published between 1987 and early 1994. Issues pertaining to the transition from foraging to farming include the habitability of the American tropics prior to the development of agriculture, theories on plant domestication and the origins of agriculture, regional syntheses of agricultural development, and the origin, evolution, and dissemination of domesticates in the Americas. Other topics reviewed include new techniques that have recently been applied to the study of prehistoric agriculture in the Americas, various approaches to the study of agricultural change, and ways in which research on ancient agricultural practices is being applied in modern experimental agriculture and rural development projects.  相似文献   
899.
900.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号